Light emitting diode driver

摘要

A light emitting diode driver includes a power supplying unit receiving an alternating current (AC) power and outputting a transformed power according to a predetermined ratio, a rectifying unit rectifying the output power from the power supplying unit, and a double voltage unit receiving the rectified power from the rectifying unit and generating an output voltage such that the level of the output voltage is variable, and has constant duty and frequency thereof even the variance of the voltage level.

主权项

1. A light emitting diode driver, comprising:
a power supplying unit including a transformer transforming a received power to an output power according to a winding ratio of the transformer; a rectifying unit rectifying the output power from the power supplying unit; a double voltage unit including a capacitor element and a double voltage switching unit and multiplying a voltage rectified by the rectifying unit to supply an output voltage to a light emitting diode; and a double voltage controlling unit having hysteresis characteristics, obtaining information regarding a level of the voltage supplied to the light emitting diode by the rectifying unit, and controlling the double voltage switching unit based on the information regarding the level of the voltage supplied by the rectifying unit.